Three explosions have occurred in the south of Iran, an Iranian news agency reported.
The explosions were recorded on Thursday in Khorramshahr in the Iranian border province of Khuzestan.
"The three explosions were so strong that they shook windows of houses," the semi-official Fars news agency said.
Khuzestan is the centre of Iran's oil industry, and has been an area of unrest with a majority Arab population.
More than half of Iran's 69 million people are Persian, but Iran also has substantial ethnic Azeri, Kurd, Arab, Turkmen, Baluchi and Lor populations.
About three per cent are Arabs and the authorities are sensitive about protests and discontent in the southwestern Arab territories.